Aquatic weeds

Aquatic weeds (or pond weeds) can normally be tolerated in small numbers, but it is when they make excessive growth that they become a nuisance, particularly in summer. In garden ponds control is relatively easy, but in larger ponds and lakes it is more difficult.

Save to My scrapbook
New Zealand pygmy weed choking a pond. Credit: RHS Advisory.

Quick facts

Common name Various
Botanical name Various
Areas affected Ponds, lakes and water features
Main causes Submerged, floating or marginal weed
Timing Some seen year round, other species seen late spring to autumn; treat when seen.

Join the RHS today and get 12 months for the price of 9

Join now

Gardeners' calendar

Find out what to do this month with our gardeners' calendar

Advice from the RHS

You may also like

Get involved

The Royal Horticultural Society is the UK’s leading gardening charity. We aim to enrich everyone’s life through plants, and make the UK a greener and more beautiful place.